您可以使用自定义RouteHandler访问会话状态。

// In global.asax
public class MvcApp : System.Web.HttpApplication
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        var route = routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
        route.RouteHandler = new MyHttpControllerRouteHandler();
    }
}

// Create two new classes
public class MyHttpControllerHandler
    : HttpControllerHandler, IRequiresSessionState
{
    public MyHttpControllerHandler(RouteData routeData) : base(routeData)
    { }
}
public class MyHttpControllerRouteHandler : HttpControllerRouteHandler
{
    protected override IHttpHandler GetHttpHandler(
        RequestContext requestContext)
    {
        return new MyHttpControllerHandler(requestContext.RouteData);
    }
}

// Now Session is visible in your Web API
public class ValuesController : ApiController
{
    public string Get(string input)
    {
        var session = HttpContext.Current.Session;
        if (session != null)
        {
            if (session["Time"] == null)
                session["Time"] = DateTime.Now;
            return "Session Time: " + session["Time"] + input;
        }
        return "Session is not availabe" + input;
    }
}

在这里找到:http://techhasnoboundary.blogspot.com/2012/03/mvc-4-web-api-access-session.html

回到基础，为什么不保持它的简单和存储会话值在一个隐藏的html值传递给你的API?

控制器

public ActionResult Index()
        {

            Session["Blah"] = 609;

            YourObject yourObject = new YourObject();
            yourObject.SessionValue = int.Parse(Session["Blah"].ToString());

            return View(yourObject);
        }

cshtml

@model YourObject

@{
    var sessionValue = Model.SessionValue;
}

<input type="hidden" value="@sessionValue" id="hBlah" />

Javascript

$(文件)。准备(函数(){

    var sessionValue = $('#hBlah').val();

    alert(sessionValue);

    /* Now call your API with the session variable */}

}

最后一个不行，拿这个，我用过。

在WebApiConfig.cs中的App_Start

    public static string _WebApiExecutionPath = "api";

    public static void Register(HttpConfiguration config)
    {
        var basicRouteTemplate = string.Format("{0}/{1}", _WebApiExecutionPath, "{controller}");

        // Controller Only
        // To handle routes like `/api/VTRouting`
        config.Routes.MapHttpRoute(
            name: "ControllerOnly",
            routeTemplate: basicRouteTemplate//"{0}/{controller}"
        );

        // Controller with ID
        // To handle routes like `/api/VTRouting/1`
        config.Routes.MapHttpRoute(
            name: "ControllerAndId",
            routeTemplate: string.Format ("{0}/{1}", basicRouteTemplate, "{id}"),
            defaults: null,
            constraints: new { id = @"^\d+$" } // Only integers 
        );

Global.asax

protected void Application_PostAuthorizeRequest()
{
  if (IsWebApiRequest())
  {
    HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);
  }
}

private static bool IsWebApiRequest()
{
  return HttpContext.Current.Request.AppRelativeCurrentExecutionFilePath.StartsWith(_WebApiExecutionPath);
}

第四点:http://forums.asp.net/t/1773026.aspx/1

你说得对，REST是无状态的。如果您使用会话，处理将变成有状态的，后续请求将能够使用状态(来自会话)。

为了给会话补水，您需要提供一个键来关联状态。在普通的asp.net应用程序中，该密钥是通过使用cookie (cookie-sessions)或url参数(无cookie会话)来提供的。

如果你需要一个会话而不是休息，那么会话在基于rest的设计中是无关紧要的。如果您需要一个会话进行验证，则使用令牌或通过IP地址授权。

根据LachlanB的回答，如果你的ApiController不在特定的目录(比如/api)中，你可以使用RouteTable.Routes来测试请求。GetRouteData，例如:

protected void Application_PostAuthorizeRequest()
    {
        // WebApi SessionState
        var routeData = RouteTable.Routes.GetRouteData(new HttpContextWrapper(HttpContext.Current));
        if (routeData != null && routeData.RouteHandler is HttpControllerRouteHandler)
            HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);
    }

Mark，如果你检查nerddinner MVC示例，逻辑几乎是一样的。

您只需要检索cookie并在当前会话中设置它。

Global.asax.cs

public override void Init()
{
    this.AuthenticateRequest += new EventHandler(WebApiApplication_AuthenticateRequest);
    base.Init();
}

void WebApiApplication_AuthenticateRequest(object sender, EventArgs e)
{
    HttpCookie cookie = HttpContext.Current.Request.Cookies[FormsAuthentication.FormsCookieName];
    FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(cookie.Value);

    SampleIdentity id = new SampleIdentity(ticket);
    GenericPrincipal prin = new GenericPrincipal(id, null); 

    HttpContext.Current.User = prin;
}

enter code here

您必须定义“SampleIdentity”类，可以从nerddinner项目中借用这个类。